RLR test BMW M3 at Sebring

The factory drivers were loaned to the team for last week's test at Road Atlanta and this week's at Sebring, and covered nearly 1500 miles of development in preparation for the car's debut in the American Le Mans Series with RLR next season.

Priaulx, Muller and Farfus worked on a wide range of components and setups, as well as sampling a variety of tyre compounds both wet and dry at Sebring this week.

RLR team boss Bobby Rahal is delighted to be developing the new car and believes the GT2 class will be the highlight of the ALMS next season.

"With all due respect to our prototype friends, GT2 will truly be one for the ages," he said. "We are part of BMW returning, you have Corvette moving from GT1, plus Panoz, Porsche and Ferrari. It will be extremely tough, competitive racing.

"It's a great relationship between Rahal Letterman and BMW North America. Sportscar racing is where I got my start so there were a lot of emotional reasons for being involved, but there also were a variety of business-related reasons as well."

Rahal Letterman will resume their development of the car at Sebring at the end of January, ahead of the opening round of next season - the Sebring 12 Houes - in March.